Quote:
Originally Posted by Sayvillelax43
thanks! this really helps alot. 
but is there always a choppy idol sound when the engine is cammed? |
No the main thing that will affect your idle is going to be the overlap. The amount of time the intake and exhaust valve are open together. This happens on the ending part of the exhaust and starting of the intake stroke. The more overlap you have the more your idle quality will suffer.
That is one reason why you dont want or cant run power brakes on cars with very large cams because you do not have the high negative pressure in the intake manifold you are getting more postive pressure.
You can increase and decrease overlap many different ways but I would choose a cam based only on overlap. You can have one cam on a 115 LSA and another on a 106 LSA and they could have the same overlap depending on what the duation @.050 is.